Keyless brake shoe



Oct. 21, 1941; J. J MCGUIRE KEYLESS BRAKE SHOE Filed June 15, 1940 gawaw j Jose p71 guike Patented Oct. 21, 1941 UNITED STATES PATENT OFFICE KEYLESS BRAKE SHOE Joseph J. McGuire, Jessup, Pa. Application June 13, 1940, Serial No. 340,386

4 Claims.

This invention relates to a brake shoe and aims to provide a novel construction which will avoid the use of a key to fasten the same to a brake head.

Considerable difficulty is experienced in connection with the attachment of brake shoes by means of a key, as the key often loosens or becomes lost as a result of the excessive vibration to which it is subjected. The key is also objectionable inasmuch as it often requires undue time in applying and removing the same The invention particularly aims to provide a means which will secure the shoe to the head without danger of loosening or detachment, and particularly by a means which is permanently connected to the brake shoe, and which enables the latter to be suspended centrally or above center and by the means now universally employed.

I further produce such a fastening means as will minimize the danger of loss of any parts through breakage or fracture.

The more specific objects and advantages will become apparent from a consideration of the description following taken in connection with the accompanying drawing illustrating an operative embodiment.

In said drawing:

Figure 1 is a view illustrating the invention as used in connection with the wheels of rolling stock;

Figure 2 is an enlarged elevation of a shoe and head according to the invention, being partly broken away to disclose details;

Figure 3 is a side elevation of the parts of Figure 2;

Figure 4 is a vertical section taken approximately on the plane of line 4-4 of Figure 2;

Figure 5 is a cross section taken on the line 55 of Figure 2, and

Figure 6 is an elevation of a brake head alone.

Referring specifically to the drawing wherein like reference characters designate like or similar parts, two wheels are shown at I which are conventional and representative of any wheels which may be used in connection with railway rolling stock, and which travel on rails, the wheels shown for instance being those used on a truck or bogie, two of such wheels usually appearing at each side of each bogie or truck as shown.

A brake shoe is shown at II which is generally arcuate as usual to conform to the periphery of the wheel III which it engages. The major portion of its rear surface is also arcuate for the most part and is overlapped by four clamp lug-s as at 12 whichare located on opposite sides of lugs or projections I3 extending inwardly and centrally'from a cross arm I3a and jointly with said projections forming T-shaped enlargements on the back of the shoe. Said lugs I2 may be made of steel or any other appropriate metal and they are preferably cast into or welded onto the shoe I I so as to be integral therewith and bendable, pliable or resilient, so that they normally tend to spring back to their solid line positions shown in Figure 3, when forced to their dotted line position of that figure.

The shoes II are carried by heads such as are detailed in Figure 6 and which are generally arcuate and designated I4. Such heads I4 at opposite ends, have central notches I5 with which the lugs I3 interfit and to which the heads are applicable when the lugs I2 are in the dotted line position of Figure 3. The heads thus provide bifurcated ends which interfit with the shoes, following which, the lugs spring or are bent down to the full line position of Figure 3, overlapping and effectively securing the heads in place.

Such a connection is important, since the fastening means is not only connected to either the head or the shoe, but should any of the parts break, the size of the fracture or shape thereof is unlikely to be such that it will become detached or released in view of the interfitting feature and retention by the lugs.

The engagement of the shoe I I and head I4 is augmented by the provision of an enlargement or rib I6 integral with the shoe and which is overlapped by ribs I 1 on the heads.

The structure is suspended or positioned operatively in the brake rigging, by means of conventional links I8 which may be selectively applied in a central notch I9 of the head I4 which is closed by the rib I6 or in an upper notch 20 of such head I4, which upper notch is closed by means of a filler body 2| and which filler body 2| has a projection 22 thereon which engages in a correspondingly shaped recess 23 of the head I4 and which filler body is positioned incidental to the positioning of the head I 4, prior to fastening of the latter to the shoe by the lugs I2.

Various changes may be resorted to provided they fall within the spiritand scope of the invention.

I claim as my invention:

1. Apparatus of the class described comprising a brake shoe, said shoe having projections at opposite ends thereof, retaining lugs on opposite sides of said projections integral with the shoe, a head having bifurcated ends interfitted with said projections and retained by said lugs, said shoe having a rib, said head having a notch for engagement by a suspending link, said notch being closed by said rib, ribs on said head engaging opposite sides of the first mentioned rib, a second notch on the head engageable by a link, filler means closing the second notch located between the head and shoe, and interengaging means between the head and filler means maintaining the filler means in place by the pressure of the head. 7 I

2. Apparatus of the class described comprising a brake shoe, said shoe having T-shaped enlargements on the back thereof at opposite ends providing a cross arm and a central projection extending inwardly therefrom, retaining lugs on opposite sides of said projections integral with the cross arms and free at their inner ends, a head having bifurcated ends interfitted with said projections and overlapped and retained by said lugs.

3. Apparatus of the class described comprising a' brake shoe, said shoe having T-shaped enlargements on the back thereof at opposite ends providing a cross arm and a central projection extending inwardly therefrom, retaining lugs on opposite sides of said projections integral with the cross arms and free at their inner ends, a

head having bifurcated ends interfitted with said projections and overlapped and retained by said lugs, said head having a notch for engagement by a suspending link, and said shoe having a rib closing said notch. 4. Apparatus of the class described comprising a brake shoe, said shoe having T-shaped enlargements on the back thereof at opposite ends providing a cross arm and a central projection extending inwardly therefrom, retaining lugs on opposite sides of said projections integral with the cross arms and free at their inner ends, a head having bifurcated ends interfitted wtih said projections and overlapped and retained by said lugs, said head having a notch for engagement by a suspending link, said shoe having a rib closing said notch, and ribs on said head engaging opposite sides of the first mentioned rib.

JOSEPH J. MCGUIRE. 

